I have a small, raised red/ skin coloured bump on my chest. it's been there for about 5 weeks, not sure if it started as a bite? i've tried cortisone

Skin lesions: If this has been a persistent lesion of the skin of the chest, it's time to see a dermatologist for definitive diagnosis.

Red bump: This may be a hemangioma which is a benign growth of tiny blood vessels called capillaries. These don't blanch when touched and are not likely to change or disappear. Of course a physician or dermatologist would have to inspect the spot to be sure.